﻿namespace YiSha.Util;

/// <summary>
/// Http连接操作帮助类 
/// </summary>
public class HttpHelper
{
    #region 是否是网址
    public static bool IsUrl(string url)
    {
        url = url.ParseToString().ToLower();
        if (url.StartsWith("http://") || url.StartsWith("https://"))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    #endregion

    #region 模拟GET
    /// <summary>
    /// GET请求
    /// </summary>
    /// <param name="url">The URL.</param>
    /// <param name="postDataStr">The post data string.</param>
    /// <returns>System.String.</returns>
    public static string HttpGet(string url, int timeout = 10 * 1000)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "GET";
        request.ContentType = "text/html;charset=UTF-8";
        request.Timeout = timeout;

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream myResponseStream = response.GetResponseStream();
        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
        string retString = myStreamReader.ReadToEnd();
        myStreamReader.Close();
        myResponseStream.Close();

        return retString;
    }
    #endregion

    #region 模拟POST
    /// <summary>
    /// POST请求
    /// </summary>
    /// <param name="posturl">The posturl.</param>
    /// <param name="postData">The post data.</param>
    /// <returns>System.String.</returns>
    public static string HttpPost(string posturl, string postData, string contentType = "application/x-www-form-urlencoded", int timeout = 10 * 1000)
    {
        Stream outstream = null;
        Stream instream = null;
        StreamReader sr = null;
        HttpWebResponse response = null;
        HttpWebRequest request = null;
        Encoding encoding = Encoding.GetEncoding("utf-8");
        byte[] data = encoding.GetBytes(postData);
        // 准备请求...
        try
        {
            // 设置参数
            request = WebRequest.Create(posturl) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            request.ContentType = contentType;
            request.Timeout = timeout;
            request.ContentLength = data.Length;
            outstream = request.GetRequestStream();
            outstream.Write(data, 0, data.Length);
            outstream.Close();
            //发送请求并获取相应回应数据
            response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            instream = response.GetResponseStream();
            sr = new StreamReader(instream, encoding);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();
            string err = string.Empty;
            return content;
        }
        catch (Exception ex)
        {
            string err = ex.Message;
            return string.Empty;
        }
    }

    /// <summary>
    /// 模拟httpPost提交表单
    /// </summary>
    /// <param name="url">POS请求的网址</param>
    /// <param name="data">表单里的参数和值</param>
    /// <param name="encoder">页面编码</param>
    /// <returns></returns>
    public static string CreateAutoSubmitForm(string url, Dictionary<string, string> data, Encoding encoder)
    {
        StringBuilder html = new StringBuilder();
        html.AppendLine("<html>");
        html.AppendLine("<head>");
        html.AppendFormat("<meta http-equiv=\"Content-Type\" content=\"text/html; charset={0}\" />", encoder.BodyName);
        html.AppendLine("</head>");
        html.AppendLine("<body onload=\"OnLoadSubmit();\">");
        html.AppendFormat("<form id=\"pay_form\" action=\"{0}\" method=\"post\">", url);
        foreach (KeyValuePair<string, string> kvp in data)
        {
            html.AppendFormat("<input type=\"hidden\" name=\"{0}\" id=\"{0}\" value=\"{1}\" />", kvp.Key, kvp.Value);
        }
        html.AppendLine("</form>");
        html.AppendLine("<script type=\"text/javascript\">");
        html.AppendLine("<!--");
        html.AppendLine("function OnLoadSubmit()");
        html.AppendLine("{");
        html.AppendLine("document.getElementById(\"pay_form\").submit();");
        html.AppendLine("}");
        html.AppendLine("//-->");
        html.AppendLine("</script>");
        html.AppendLine("</body>");
        html.AppendLine("</html>");
        return html.ToString();
    }
    #endregion

    #region 预定义方法或者变更
    //默认的编码
    private Encoding encoding = Encoding.Default;
    //HttpWebRequest对象用来发起请求
    private HttpWebRequest request = null;
    //获取影响流的数据对象
    private HttpWebResponse response = null;
    /// <summary>
    /// 根据相传入的数据，得到相应页面数据
    /// </summary>
    /// <param name="strPostdata">传入的数据Post方式,get方式传NUll或者空字符串都可以</param>
    /// <returns>string类型的响应数据</returns>
    private HttpResult GetHttpRequestData(HttpItem httpItem)
    {
        //返回参数
        HttpResult result = new HttpResult();
        try
        {
            #region 得到请求的response
            using (response = (HttpWebResponse)request.GetResponse())
            {
                result.Header = response.Headers;
                if (response.Cookies != null)
                {
                    result.CookieCollection = response.Cookies;
                }
                if (response.Headers["set-cookie"] != null)
                {
                    result.Cookie = response.Headers["set-cookie"];
                }

                MemoryStream _stream = new MemoryStream();
                //GZIIP处理
                if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
                {
                    //开始读取流并设置编码方式
                    //new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
                    //.net4.0以下写法
                    _stream = GetMemoryStream(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress));
                }
                else
                {
                    //开始读取流并设置编码方式
                    //response.GetResponseStream().CopyTo(_stream, 10240);
                    //.net4.0以下写法
                    _stream = GetMemoryStream(response.GetResponseStream());
                }
                //获取Byte
                byte[] RawResponse = _stream.ToArray();
                //是否返回Byte类型数据
                if (httpItem.ResultType == ResultType.Byte)
                {
                    result.ResultByte = RawResponse;
                }
                //从这里开始我们要无视编码了
                if (encoding == null)
                {
                    string temp = Encoding.Default.GetString(RawResponse, 0, RawResponse.Length);
                    //<meta(.*?)charset([\s]?)=[^>](.*?)>
                    Match meta = Regex.Match(temp, "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline);
                    string charter = (meta.Groups.Count > 2) ? meta.Groups[2].Value : string.Empty;
                    charter = charter.Replace("\"", string.Empty).Replace("'", string.Empty).Replace(";", string.Empty);
                    if (charter.Length > 0)
                    {
                        charter = charter.ToLower().Replace("iso-8859-1", "gbk");
                        encoding = Encoding.GetEncoding(charter);
                    }
                    else
                    {
                        if (response.CharacterSet !=null && response.CharacterSet.ToLower().Trim() == "iso-8859-1")
                        {
                            encoding = Encoding.GetEncoding("gbk");
                        }
                        else
                        {
                            if (string.IsNullOrEmpty(response.CharacterSet.Trim()))
                            {
                                encoding = Encoding.UTF8;
                            }
                            else
                            {
                                encoding = Encoding.GetEncoding(response.CharacterSet);
                            }
                        }
                    }
                }
                //得到返回的HTML
                result.Html = encoding.GetString(RawResponse);
                //最后释放流
                _stream.Close();
            }
            #endregion
        }
        catch (WebException ex)
        {
            //这里是在发生异常时返回的错误信息
            result.Html = "String Error";
            response = (HttpWebResponse)ex.Response;
        }
        if (httpItem.IsToLower)
        {
            result.Html = result.Html.ToLower();
        }
        return result;
    }

    /// <summary>
    /// 4.0以下.net版本取数据使用
    /// </summary>
    /// <param name="streamResponse">流</param>
    private static MemoryStream GetMemoryStream(Stream streamResponse)
    {
        MemoryStream _stream = new MemoryStream();
        int Length = 256;
        Byte[] buffer = new Byte[Length];
        int bytesRead = streamResponse.Read(buffer, 0, Length);
        // write the required bytes  
        while (bytesRead > 0)
        {
            _stream.Write(buffer, 0, bytesRead);
            bytesRead = streamResponse.Read(buffer, 0, Length);
        }
        return _stream;
    }

    /// <summary>
    /// 为请求准备参数
    /// </summary>
    ///<param name="httpItem">参数列表</param>
    /// <param name="_Encoding">读取数据时的编码方式</param>
    private void SetRequest(HttpItem httpItem)
    {
        // 验证证书
        SetCer(httpItem);
        // 设置代理
        SetProxy(httpItem);
        //请求方式Get或者Post
        request.Method = httpItem.Method;
        request.Timeout = httpItem.Timeout;
        request.ReadWriteTimeout = httpItem.ReadWriteTimeout;
        //Accept
        request.Accept = httpItem.Accept;
        //ContentType返回类型
        request.ContentType = httpItem.ContentType;
        //UserAgent客户端的访问类型，包括浏览器版本和操作系统信息
        request.UserAgent = httpItem.UserAgent;
        // 编码
        SetEncoding(httpItem);
        //设置Cookie
        SetCookie(httpItem);
        //来源地址
        request.Referer = httpItem.Referer;
        //是否执行跳转功能
        request.AllowAutoRedirect = httpItem.Allowautoredirect;
        //设置Post数据
        SetPostData(httpItem);
        //设置最大连接
        if (httpItem.Connectionlimit > 0)
        {
            request.ServicePoint.ConnectionLimit = httpItem.Connectionlimit;
        }
    }
    /// <summary>
    /// 设置证书
    /// </summary>
    /// <param name="httpItem"></param>
    private void SetCer(HttpItem httpItem)
    {
        if (!string.IsNullOrEmpty(httpItem.CerPath))
        {
            //这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            //初始化对像，并设置请求的URL地址
            request = (HttpWebRequest)WebRequest.Create(GetUrl(httpItem.URL));
            //创建证书文件
            X509Certificate objx509 = new X509Certificate(httpItem.CerPath);
            //添加到请求里
            request.ClientCertificates.Add(objx509);
        }
        else
        {
            //初始化对像，并设置请求的URL地址
            request = (HttpWebRequest)WebRequest.Create(GetUrl(httpItem.URL));
        }
    }
    /// <summary>
    /// 设置编码
    /// </summary>
    /// <param name="httpItem">Http参数</param>
    private void SetEncoding(HttpItem httpItem)
    {
        if (string.IsNullOrEmpty(httpItem.Encoding) || httpItem.Encoding.ToLower().Trim() == "null")
        {
            //读取数据时的编码方式
            encoding = null;
        }
        else
        {
            //读取数据时的编码方式
            encoding = System.Text.Encoding.GetEncoding(httpItem.Encoding);
        }
    }
    /// <summary>
    /// 设置Cookie
    /// </summary>
    /// <param name="httpItem">Http参数</param>
    private void SetCookie(HttpItem httpItem)
    {
        if (!string.IsNullOrEmpty(httpItem.Cookie))
        {
            //Cookie
            request.Headers[HttpRequestHeader.Cookie] = httpItem.Cookie;
        }
        //设置Cookie
        if (httpItem.CookieCollection != null)
        {
            request.CookieContainer = new CookieContainer();
            request.CookieContainer.Add(httpItem.CookieCollection);
        }
    }
    /// <summary>
    /// 设置Post数据
    /// </summary>
    /// <param name="httpItem">Http参数</param>
    private void SetPostData(HttpItem httpItem)
    {
        //验证在得到结果时是否有传入数据
        if (request.Method.Trim().ToLower().Contains("post"))
        {
            //写入Byte类型
            if (httpItem.PostDataType == PostDataType.Byte)
            {
                //验证在得到结果时是否有传入数据
                if (httpItem.PostdataByte != null && httpItem.PostdataByte.Length > 0)
                {
                    request.ContentLength = httpItem.PostdataByte.Length;
                    request.GetRequestStream().Write(httpItem.PostdataByte, 0, httpItem.PostdataByte.Length);
                }
            }//写入文件
            else if (httpItem.PostDataType == PostDataType.FilePath)
            {
                StreamReader r = new StreamReader(httpItem.Postdata, encoding);
                byte[] buffer = Encoding.Default.GetBytes(r.ReadToEnd());
                r.Close();
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
            }
            else
            {
                //验证在得到结果时是否有传入数据
                if (!string.IsNullOrEmpty(httpItem.Postdata))
                {
                    byte[] buffer = Encoding.Default.GetBytes(httpItem.Postdata);
                    request.ContentLength = buffer.Length;
                    request.GetRequestStream().Write(buffer, 0, buffer.Length);
                }
            }
        }
    }
    /// <summary>
    /// 设置代理
    /// </summary>
    /// <param name="httpItem">参数对象</param>
    private void SetProxy(HttpItem httpItem)
    {
        if (string.IsNullOrEmpty(httpItem.ProxyUserName) && string.IsNullOrEmpty(httpItem.ProxyPwd) && string.IsNullOrEmpty(httpItem.ProxyIp))
        {
            //不需要设置
        }
        else
        {
            //设置代理服务器
            WebProxy myProxy = new WebProxy(httpItem.ProxyIp, false);
            //建议连接
            myProxy.Credentials = new NetworkCredential(httpItem.ProxyUserName, httpItem.ProxyPwd);
            //给当前请求对象
            request.Proxy = myProxy;
            //设置安全凭证
            request.Credentials = CredentialCache.DefaultNetworkCredentials;
        }
    }
    /// <summary>
    /// 回调验证证书问题
    /// </summary>
    /// <param name="sender">流对象</param>
    /// <param name="certificate">证书</param>
    /// <param name="chain">X509Chain</param>
    /// <param name="errors">SslPolicyErrors</param>
    /// <returns>bool</returns>
    public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
    {
        // 总是接受    
        return true;
    }
    #endregion

    #region 普通类型
    /// <summary>    
    /// 传入一个正确或不正确的URl，返回正确的URL
    /// </summary>    
    /// <param name="URL">url</param>   
    /// <returns>
    /// </returns>
    public static string GetUrl(string URL)
    {
        if (!(URL.Contains("http://") || URL.Contains("https://")))
        {
            URL = "http://" + URL;
        }
        return URL;
    }
    ///<summary>
    ///采用https协议访问网络,根据传入的URl地址，得到响应的数据字符串。
    ///</summary>
    ///<param name="httpItem">参数列表</param>
    ///<returns>String类型的数据</returns>
    public HttpResult GetHtml(HttpItem httpItem)
    {
        //准备参数
        SetRequest(httpItem);
        //调用专门读取数据的类
        return GetHttpRequestData(httpItem);
    }
    #endregion
}

/// <summary>
/// Http请求参考类 
/// </summary>
public class HttpItem
{
    string _URL;
    /// <summary>
    /// 请求URL必须填写
    /// </summary>
    public string URL
    {
        get { return _URL; }
        set { _URL = value; }
    }
    string _Method = "GET";
    /// <summary>
    /// 请求方式默认为GET方式
    /// </summary>
    public string Method
    {
        get { return _Method; }
        set { _Method = value; }
    }
    int _Timeout = 100000;
    /// <summary>
    /// 默认请求超时时间
    /// </summary>
    public int Timeout
    {
        get { return _Timeout; }
        set { _Timeout = value; }
    }
    int _ReadWriteTimeout = 30000;
    /// <summary>
    /// 默认写入Post数据超时间
    /// </summary>
    public int ReadWriteTimeout
    {
        get { return _ReadWriteTimeout; }
        set { _ReadWriteTimeout = value; }
    }
    string _Accept = "text/html, application/xhtml+xml, */*";
    /// <summary>
    /// 请求标头值 默认为text/html, application/xhtml+xml, */*
    /// </summary>
    public string Accept
    {
        get { return _Accept; }
        set { _Accept = value; }
    }
    string _ContentType = "text/html";
    /// <summary>
    /// 请求返回类型默认 text/html
    /// </summary>
    public string ContentType
    {
        get { return _ContentType; }
        set { _ContentType = value; }
    }
    string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
    /// <summary>
    /// 客户端访问信息默认Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
    /// </summary>
    public string UserAgent
    {
        get { return _UserAgent; }
        set { _UserAgent = value; }
    }
    string _Encoding = string.Empty;
    /// <summary>
    /// 返回数据编码默认为NUll,可以自动识别
    /// </summary>
    public string Encoding
    {
        get { return _Encoding; }
        set { _Encoding = value; }
    }
    private PostDataType _PostDataType = PostDataType.String;
    /// <summary>
    /// Post的数据类型
    /// </summary>
    public PostDataType PostDataType
    {
        get { return _PostDataType; }
        set { _PostDataType = value; }
    }
    string _Postdata;
    /// <summary>
    /// Post请求时要发送的字符串Post数据
    /// </summary>
    public string Postdata
    {
        get { return _Postdata; }
        set { _Postdata = value; }
    }
    private byte[] _PostdataByte = null;
    /// <summary>
    /// Post请求时要发送的Byte类型的Post数据
    /// </summary>
    public byte[] PostdataByte
    {
        get { return _PostdataByte; }
        set { _PostdataByte = value; }
    }
    CookieCollection cookiecollection = null;
    /// <summary>
    /// Cookie对象集合
    /// </summary>
    public CookieCollection CookieCollection
    {
        get { return cookiecollection; }
        set { cookiecollection = value; }
    }
    string _Cookie = string.Empty;
    /// <summary>
    /// 请求时的Cookie
    /// </summary>
    public string Cookie
    {
        get { return _Cookie; }
        set { _Cookie = value; }
    }
    string _Referer = string.Empty;
    /// <summary>
    /// 来源地址，上次访问地址
    /// </summary>
    public string Referer
    {
        get { return _Referer; }
        set { _Referer = value; }
    }
    string _CerPath = string.Empty;
    /// <summary>
    /// 证书绝对路径
    /// </summary>
    public string CerPath
    {
        get { return _CerPath; }
        set { _CerPath = value; }
    }
    private Boolean isToLower = true;
    /// <summary>
    /// 是否设置为全文小写
    /// </summary>
    public Boolean IsToLower
    {
        get { return isToLower; }
        set { isToLower = value; }
    }
    private Boolean allowautoredirect = true;
    /// <summary>
    /// 支持跳转页面，查询结果将是跳转后的页面
    /// </summary>
    public Boolean Allowautoredirect
    {
        get { return allowautoredirect; }
        set { allowautoredirect = value; }
    }
    private int connectionlimit = 1024;
    /// <summary>
    /// 最大连接数
    /// </summary>
    public int Connectionlimit
    {
        get { return connectionlimit; }
        set { connectionlimit = value; }
    }
    private string proxyusername = string.Empty;
    /// <summary>
    /// 代理Proxy 服务器用户名
    /// </summary>
    public string ProxyUserName
    {
        get { return proxyusername; }
        set { proxyusername = value; }
    }
    private string proxypwd = string.Empty;
    /// <summary>
    /// 代理 服务器密码
    /// </summary>
    public string ProxyPwd
    {
        get { return proxypwd; }
        set { proxypwd = value; }
    }
    private string proxyip = string.Empty;
    /// <summary>
    /// 代理 服务IP
    /// </summary>
    public string ProxyIp
    {
        get { return proxyip; }
        set { proxyip = value; }
    }
    private ResultType resulttype = ResultType.String;
    /// <summary>
    /// 设置返回类型String和Byte
    /// </summary>
    public ResultType ResultType
    {
        get { return resulttype; }
        set { resulttype = value; }
    }
}

/// <summary>
/// Http返回参数类
/// </summary>
public class HttpResult
{
    string _Cookie = string.Empty;
    /// <summary>
    /// Http请求返回的Cookie
    /// </summary>
    public string Cookie
    {
        get { return _Cookie; }
        set { _Cookie = value; }
    }
    CookieCollection cookiecollection = null;
    /// <summary>
    /// Cookie对象集合
    /// </summary>
    public CookieCollection CookieCollection
    {
        get { return cookiecollection; }
        set { cookiecollection = value; }
    }
    private string html = string.Empty;
    /// <summary>
    /// 返回的String类型数据 只有ResultType.String时才返回数据，其它情况为空
    /// </summary>
    public string Html
    {
        get { return html; }
        set { html = value; }
    }
    private byte[] resultbyte = null;
    /// <summary>
    /// 返回的Byte数组 只有ResultType.Byte时才返回数据，其它情况为空
    /// </summary>
    public byte[] ResultByte
    {
        get { return resultbyte; }
        set { resultbyte = value; }
    }
    private WebHeaderCollection header = new WebHeaderCollection();
    //header对象
    public WebHeaderCollection Header
    {
        get { return header; }
        set { header = value; }
    }
}

/// <summary>
/// 返回类型
/// </summary>
public enum ResultType
{
    String, //表示只返回字符串
    Byte //表示返回字符串和字节流
}

/// <summary>
/// Post的数据格式默认为string
/// </summary>
public enum PostDataType
{
    String, //字符串
    Byte, //字符串和字节流
    FilePath //表示传入的是文件
}